62 
T. O. HALLE, 
(Schvved. Südpolar-Exp. 
this the more so, as they are considerably smaller. The follow- 
ing diagnosis, which does not sufficiently characterize the whole 
species, is based on the former group of specimens. 
Frond narrow, very long and linear, with parallel sides. Pinnæ 
distant or somewhat closely set, those on the same side hardly ever 
overlapping, all attached at a wide to nearly right angle. Bases 
of pinnæ obliquely inserted on the upper side of the rachis, those 
of opposite pinnæ overlapping. Pinnæ lanceolate to oblong, 
slightly falcate, with an oblique, somewhat obtuse apex. Ante- 
rior basal lobe large and sharply set off against the upper part 
of the lamina. Both edges of the lamina, above the basal lobe, 
for some distance parallel and almost straight. Posterior edge in 
the lower part of the pinna almost straight right down 
to the rachis, or slightly concave, not rounded to form 
a lobe. Venation dense, of bifurcating veins radiating 
from a point near the posterior corner of the base. 
A characteristic feature of this type of frond is its 
great length and narrow linear shape. Most of the speci- 
mens are small but show the shape of the frond in the 
straight parallel course of the sides. The best specimen, 
the one shown in text-fig. 15, has a length of nearly 
20 cm., with the sides almost parallel. The gradual 
tapering is almost imperceptible, the breadth being 2.2 
linearis n. sp. cm. near the broken base and 1.9 cm. at the likewise 
I rond, ,i upper end. The broadest specimen is the one 
and enlarged ^ ^ ^ 
pinna, 3 /i- shown in pi. 7, fig. I. In all the larger, typical speci- 
mens the pinnæ are rather distant. Sometimes the ad- 
jacent pinnæ on the same side of the rachis are just in touch, 
but not overlapping, with their auriculate bases; in other cases, 
as in the large specimen in text-fig. 15, they are removed some 
var3nng distance from each other. The pinnæ have a strongly 
developed anterior basal lobe which is well defined against the 
upper oblong or linear portion of the lamina. Near the apex the 
proximal edge bends rather sharpl}^ forward, so that the ending 
of the lamina becomes abrupt and distinctly oblique (text-fig. 15). 
The most characteristic feature of the species, however, is that 
the proximal edge of the pinna in its lower part is almost per- 
fectly straight or even a little concave (text-fig. 15) right down 
to the rachis, and is not gradually rounded to form a basal lobe. 
Fig. 15. 
Oiozamites 
